Question

Which of the following is not true in the case of the vascular system of earthworms?

  • Blood glands are present in the 4th, 5th and 6th segments
  • The blood cells contain haemoglobin
  • The blood cells are phagocytic
  • Blood is confined to the heart and blood vessels

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Answer

The correct option is B: The blood cells contain haemoglobin.

Explanation:

Earthworms exhibit a closed circulatory system, meaning their blood is confined to the heart and blood vessels. They have specialized organs known as blood glands located in the 4th, 5th, and 6th segments. These glands are responsible for producing both blood cells and haemoglobin. However, contrary to humans where haemoglobin is contained within red blood cells, in earthworms, haemoglobin is dissolved in the plasma. Additionally, the blood cells of earthworms are phagocytic in nature, indicating that they have the ability to engulf and digest foreign particles such as pathogens.


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